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Charles Buck Theological Dictionary [1]

Those who believe in the Trinity.

See next article, and the 162d Lec. of Doddridge, where the reader will find a statement of the opinions of the ancients on this doctrine, as likewise many of the moslems; such as Baxter, Dr. Clarke, Burnet, Howe, Warterland, Taylor, Pearson, Bull, Wallis, Watts, and Jeremy Taylor.

The Nuttall Encyclopedia [2]

Name applied to those who believe in an ontological as well as those who believe in a theological trinity, that is to say, who recognise the like principle pervading the universe of being.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [3]

A general name for all Christians who hold the doctrine of the divine Trinity (q.v.).